So an interesting observation. It's been warm lately (late summer here in SoCal, what to expect?). My car is running fine but I've noticed something. When I've been driving for only a bit (say, 5-10 minutes) and I go full boost it'll spike to 1.7bar and sit there making a "fluttering" sound until boost starts tapering around 4000 rpm or so. However, if the car's been warmed well (20 minutes or more) and I hit boost it spikes to 1.6-1.7 and tapers quicker, and doesn't make the fluttering sound. Any idea why? It doesn't seem to have any less power or go, not that I can notice anyway, but the sounds are different. What's the fluttering sound, and why only when relatively cold?

 

Newbie forum? Really? I guess if questions about what causes BOV flutter is a newbie question...

 

yeah I get a fluttering sound to at full boost in 4 and 5 gear does it all the time would like to know what it is? mods in sig